title: Investigation of a compact coaxially fed switched oscillator.
abstract: To generate a relative high frequency mesoband microwave, a compact coaxially fed transmission line switched oscillator with high voltage capability is investigated. The characteristic impedance and voltage capability of the low impedance transmission line (LITL) have been analyzed. It is shown that the working voltage of the oscillator can reach up to 200 kV when it is filled by pressurized nitrogen and charged by a nanosecond driving source. By utilizing a commercial electromagnetic simulation code, the transient performance of the switched oscillator with a lumped resistance load is simulated. It is illustrated that the center frequency of the output signal reaches up to ~0.6 GHz when the spark gap practically closes with a single channel. Besides, the influence of the closing mode and rapidity of the spark gap, the permittivity of the insulator at the output end of the LITL, and the load impedance on the transient performance of the designed oscillator has been analyzed in quantification. Finally, the good transient performance of the switched oscillator has been preliminarily proved by the experiment.
authors.affiliation: College of Photoelectrical Science and Engineering, National University of Defense Technology, Hunan 410073, People's Republic of China.
authors.forename: Yuwei
authors.initials: Y
authors.lastname: Wang
authors.forename: Dongqun
authors.initials: D
authors.lastname: Chen
authors.forename: Jiande
authors.initials: J
authors.lastname: Zhang
authors.forename: Shengguang
authors.initials: S
authors.lastname: Cao
authors.forename: Da
authors.initials: D
authors.lastname: Li
authors.forename: Chebo
authors.initials: C
authors.lastname: Liu